Alkali borosilicate glass by fly ash from a coal-fired power plant.
The possibility of using coal fly ash as a silica source for alkali borosilicate glass was investigated. Alkali borosilicate glasses were prepared from the coal fly ash mixed with 30 wt.% reagents composed of Na(2)O and B(2)O(3) by susceptor-induction heating. Their densities ranged from 2.24 to 2.55 g cm(-3) and decreased as the amount of B(2)O(3) addition increased. However, the Vickers microhardness showed a different tendency with the density since the glass network connectivity improved by boron anomaly, which was identified by a nuclear magnetic resonance analysis. The Vickers microhardness of the glass product, with the addition of 15 wt.% B(2)O(3) and 15 wt.% Na(2)O, was about 4030 MPa. Furthermore, the changes in microstructure were consistent with those in the chemical stability by the toxicity characteristic leaching procedure (TCLP).
Park
Jong Soo
JS
Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan.
Taniguchi
Shoji
S
Park
Young Jun
YJ
D000468:Alkalies / Q000737:chemistry; D001895:Boron / Q000737:chemistry; D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D003031:Coal; D060729:Coal Ash; D005898:Glass / Q000032:analysis / Q000737:chemistry*; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry*; D011210:Power Plants; D017640:Silicates / Q000737:chemistry
D000468:Alkalies; D003031:Coal; D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D017640:Silicates; D002244:Carbon; D001895:Boron